Squeeze all the water out of your thaw spinach put the spinach in a bowl . You can use the sliced mozzarella cheese or what you choose. Flatten out your chicken breasts,add spinach ,cheese roll the breast hold with toothpicks, use 4 toothpicks to hold each chicken breast. Add tablespoon oil on baking sheet.Bake at 375 for 45 minutes or till done.